An obligate parasite, or holoparasite, is a parasitic organism that cannot complete its life-cycle without exploiting a suitable host.
Part of the Andes mountain range, Aconcagua is the second highest of the Seven Summits, behind only Mount Everest in Asia. At 22,837 feet (6,961 meters), not only is it the highest mountain in South America, it is the tallest peak in all of the Americas as well as the Southern and Western Hemispheres.
Meet Hyperion, the Worldâs Tallest Tree. Up until August 2006, the tallest known tree in the world was a 369-foot California redwood (Sequoia sempervirens) nicknamed âStratosphere Giantâ, located somewhere in the Humboldt Redwoods State Park in California.